Display Device Power Saving Mode Based on Illuminance
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Solution Overview
Problem
Display devices currently rely on DPMS standards for power management, which require input signals from computer devices to switch between normal and power saving modes, limiting independent control over power consumption based on environmental conditions.
Innovation Solution
Incorporating an illuminance sensor and controller in the display device to autonomously switch to a power saving mode when ambient illuminance is below a predetermined value, allowing for reduced power consumption independent of the computer device's operation status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device uses DPMS standard for power management, then the power saving mode can be controlled based on computer device signals, but the display device cannot independently control power consumption based on environmental conditions
Solution Approach 1:
The display device uses its own illuminance sensor to detect ambient light conditions and automatically determines when to switch to power saving mode, without requiring signals from the connected computer device. This self-service approach enables independent environmental adaptation while maintaining simple control logic
Solution Approach 2:
The illuminance sensor acts as an intermediary component that provides environmental information to the control unit, enabling the display device to make autonomous power management decisions based on ambient light conditions rather than relying solely on computer device signals
2Use of energy by moving object
If the display device switches to power saving mode based on computer device signals, then power consumption is reduced according to computer operation status, but power consumption cannot be reduced when the computer is actively operating but the environment is dark
Solution Approach 1:
The control unit continuously monitors illuminance sensor output and automatically adjusts the operating mode based on the detected ambient light levels. This feedback mechanism ensures the display device responds autonomously to environmental changes, switching to power saving mode when it is dark regardless of computer device operation status
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables the display device to reduce power consumption based on environmental conditions, optimizing energy use without relying on computer device signals, thereby minimizing wasteful power usage even when connected to continuously operating computers.
Implementation Method 1
an illuminance sensor for detecting the illuminance of an environment in which the display device is placed
Data Source
AI summary
An illuminance sensor detects an illuminance value for an environment in which a display device is placed and provides the illuminance value to a controller. The controller determines whether to cause the display device to make a transition to a power saving mode or not in accordance with the illuminance value inputted thereto. For the transition to the power saving mode, the controller stops the operation of a backlight drive signal generator to turn off a backlight unit, and stops the supply of power and a display signal to a liquid crystal panel.